Wallpaper not properly fit on device screen

问题

I have one set of images in one drawable folder. I have one button to set image as wallpaper on device screen. But when I set this image as wallpaper its either zoom or cropped. I want image should fit on screen size. I have seen lots of links on SO but no link is work for me. This is the code I am trying so far.

Code-

Bitmap bmap2 = BitmapFactory.decodeStream(getResources().openRawResource(mThumb[position]));
DisplayMetrics metrics = new DisplayMetrics(); 
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels; 
int width = metrics.widthPixels;
Bitmap bitmap = Bitmap.createScaledBitmap(bmap2, width, height, true); 
WallpaperManager wallpaperManager = WallpaperManager.getInstance(this); 
try {
  wallpaperManager.setBitmap(bitmap);
  } catch (IOException e) {
  e.printStackTrace();
}

I also added following lines in manifest-

<uses-permission android:name="android.permission.SET_WALLPAPER_HINTS"/>
<uses-permission android:name="android.permission.SET_WALLPAPER" />

回答1:

Hello This is working with drawable image i have checked it..

                DisplayMetrics metrics = new DisplayMetrics(); 
                getWindowManager().getDefaultDisplay().getMetrics(metrics);
                int height = metrics.heightPixels; 
                int width = metrics.widthPixels;
                Bitmap tempbitMap = BitmapFactory.decodeResource(getResources(), R.drawable.img);
                Bitmap bitmap = Bitmap.createScaledBitmap(tempbitMap,width,height, true);
                WallpaperManager wallpaperManager = WallpaperManager.getInstance(MainActivity.this); 
                wallpaperManager.setWallpaperOffsetSteps(1, 1);
                wallpaperManager.suggestDesiredDimensions(width, height);
                try {
                  wallpaperManager.setBitmap(bitmap);
                  } catch (IOException e) {
                  e.printStackTrace();
                }

Also mention these permissions in Manifest.xml..

    <uses-permission android:name="android.permission.SET_WALLPAPER_HINTS" />
    <uses-permission android:name="android.permission.SET_WALLPAPER" />

This is screenshot..

For reset Fit wallpaper of screen store the image path in shared preferences and use Boot Completed Receiver then reset the same wallpaper on the screen....

The broadcast receiver is..

import java.io.IOException;

import android.app.WallpaperManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.WindowManager;

public class BootReceiver extends BroadcastReceiver {
private static final String TAG="BootReceiver";

@Override public void onReceive(Context context,Intent intent){
    try{
            DisplayMetrics metrics = new DisplayMetrics(); 
            WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
            windowManager.getDefaultDisplay().getMetrics(metrics);
            int height = metrics.heightPixels; 
            int width = metrics.widthPixels;
            Bitmap tempbitMap = BitmapFactory.decodeResource(context.getResources(), R.drawable.img);
            Bitmap bitmap = Bitmap.createScaledBitmap(tempbitMap,width,height, true);
            WallpaperManager wallpaperManager = WallpaperManager.getInstance(context); 
            wallpaperManager.setWallpaperOffsetSteps(1, 1);
            wallpaperManager.suggestDesiredDimensions(width, height);
            try {
              wallpaperManager.setBitmap(bitmap);
              } catch (IOException e) {
              e.printStackTrace();
            }
    }catch(Exception e){
        Log.e(TAG,e.toString());
    }
}
}

After Add these lines in Manifest.xml

       <receiver
            android:name=".BootReceiver"
            android:enabled="true"
            android:exported="true"
            android:label="BootReceiver" >
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" >
                </action>
            </intent-filter>
        </receiver>

回答2:

try this code

Bitmap bmap2 =BitmapFactory.decodeStream(getResources().openRawResource(mThumb[position]));
    DisplayMetrics metrics = new DisplayMetrics(); 
    getWindowManager().getDefaultDisplay().getMetrics(metrics);
    int height = metrics.heightPixels; 
    int width = metrics.widthPixels;
    Bitmap bitmap = Bitmap.createScaledBitmap(bmap2, width, height, true); 
    WallpaperManager wallpaperManager = WallpaperManager.getInstance(this); 
    wallpaperManager.setWallpaperOffsetSteps(1, 1);
    wallpaperManager.suggestDesiredDimensions(width, height);
    try {
      wallpaperManager.setBitmap(bitmap);
      } catch (IOException e) {
      e.printStackTrace();
    }

回答3:

If you have image URL then use :

WallpaperManager wpm = WallpaperManager.getInstance(context);
InputStream ins = new URL("absolute/path/of/image").openStream();
wpm.setStream(ins);

If you have image URI then use

WallpaperManager wpm = WallpaperManager.getInstance(context);
wpm.setResource(Uri.of.image);

In your manifest file:

<uses-permission android:name="android.permission.SET_WALLPAPER"></uses-permission>

and don't forget to place this code in AsyncTask.

回答4:

Try this code:

public void changeWallpaper(String path) {
        FileInputStream is;
        BufferedInputStream bis;
        WallpaperManager wallpaperManager;
        Drawable wallpaperDrawable;
        File sdcard = Environment.getExternalStorageDirectory();
        try {
            is = new FileInputStream(new File(path));
            bis = new BufferedInputStream(is);
            Bitmap bitmap = BitmapFactory.decodeStream(bis);
            Bitmap useThisBitmap = Bitmap.createBitmap(bitmap);
            wallpaperManager = WallpaperManager.getInstance(getActivity());
            wallpaperDrawable = wallpaperManager.getDrawable();
            wallpaperManager.setBitmap(useThisBitmap);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

In this example , I have used image from my device SD card...

It's perfectly worked for me..

回答5:

notice: maybe not work for you.

you need this:

WallpaperManager wallpaperManager = WallpaperManager.getInstance(this); 
             try {
              wallpaperManager.setBitmap(bitmap);

              wallpaperManager.suggestDesiredDimensions(width, height);
                Toast.makeText(this, "Wallpaper Set", Toast.LENGTH_SHORT).show();
             } catch (IOException e) {
              e.printStackTrace();
             }

enter link description here

来源：https://stackoverflow.com/questions/22759358/wallpaper-not-properly-fit-on-device-screen